At 3.2V, the OCZ PC4000 Gold Dual Channel VX seemed very happy and the system was stable all the way up to 260 MHz. Anything higher caused more stability problems. It seems like the memory was starting to top out, since the voltage had to be increased substantially to squeeze out a few more MHz. In the end, the memory hit a high of 268 MHz while running using 2-2-2-5 memory timings with a voltage of 3.5V . Increasing the voltage higher actually lowered the memory's maximum overclock.